Precious stone



FIG. 1 is a perspective view of the precious stone showing its new design;

FIG. 2 is a side view of the precious stone shown in FIG. 1;

FIG. 3 is a top view of the precious stone shown in FIG. 1; and,

FIG. 4 is a bottom and rear view of the precious stone shown in FIG. 1. 

The ornamental design for a precious stone, as shown and described. 